Can u change the slider background

im making my own theme and i started wondering, on the lockscreen can u change the background of the slider...i have already change the look of the slider, but i meant can u add things to it or change its colour.

Have attached a pic - as you can see, there are stars or somesort of thing on the bit where u slide the unlock bar. I want to be able to add those to and maybe change the colour of the whole bar.

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you can do it but i think you can only change the actual slider like where the arrow is and the text where it says slide to unlock.
if you look it up on YouTube im sure there is plenty of tutorials on there.